期刊
ACS CATALYSIS
卷 11, 期 19, 页码 12087-12095出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c02124
关键词
carbon dioxide; dry reforming of methane; Ni-based catalysts; coke resistance; in situ Raman
资金
- National Key R&D Program of China [2017YFE0132400]
- University at Buffalo, SUNY
The addition of molybdenum was found to improve both the activity and coking resistance of traditional nickel catalysts by restraining nickel oxidation and a unique MoOx <-> MoCxOy redox cycle.
Dry reforming of methane (DRM) can convert greenhouse gases (CO2 and CH4) into value-added syngas (CO and H-2), which is one of the promising approaches to achieve carbon neutrality. Designing coking resistant catalysts is still a challenge for an efficient DRM reaction. Here, we developed an efficient binary Mo-Ni catalyst through elucidating the promotional role of Mo in boosting the coking resistance of Ni-based catalysts during the DRM. Mo-modified ZSM-5 served as the smart support, which provided the dynamic variation between MoOx and MoOxCy, enabling efficient carbon removal during the DRM reaction. Furthermore, the introduction of Mo maintained more active Ni-0 species and enhanced the activity. A more effective pathway via a formate intermediate driven by the Mo-modified Ni/ZSM-5 further suppressed coking during DRM. This work discovered that both activity and coking resistance of traditional Ni catalysts can be simultaneously improved due to the addition of Mo through restraining Ni oxidation and a unique MoOx <-> MoCxOy redox cycle.
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